New, BSD license, code does not need to be in cddl. Most of the new D scripts and programs go into either share/dtrace or the DTrace Toolkit port. Since this is a script I'd put it into share/dtrace if you want it in the src tree.

Mar 14 2017

Actually it was in kern_fork() that I first looked, but, we do not have access to the syscall args structure at that point. I'll dig a bit more to see if I missed a pointer that would lead me there, or figure out if there is a reasonable way to synthesize one.